USGS WPhase Moment Solution
NEAR EAST COAST OF HONSHU, JAPAN
13/ 2/19 12:27:38.00 Epicenter: 35.245 140.957 MW 5.4 USGS/WPHASE CENTROID MOMENT TENSOR 13/ 2/19 12:27:38.00 Centroid: 35.345 141.446 Depth 30 No. of sta: 27 Moment Tensor; Scale 10**17 Nm Mrr= 0.60 Mtt=-0.71 Mpp= 0.10 Mrt= 1.53 Mrp= 0.40 Mtp=-0.11 Principal axes: T Val= 1.66 Plg=56 Azm=341 N = 0.11 3 76 P = -1.77 33 168 Best Double Couple:Mo=1.7*10**17 NP1:Strike=271 Dip=12 Slip= 106 NP2: 75 79 87
The figure above shows a visual representation of the style of faulting (focal mechanism)
derived from the estimated moment tensor.
Shaded areas show quadrants of the focal sphere in which the P-wave first-motions
are away from the source, and unshaded areas show quadrants
in which the P-wave first-motions are toward the source.
The dots represent the axis of maximum compressional strain
(in black, called the "P-axis")
and the axis of maximum extensional strain (in white, called the "T-axis")
resulting from the earthquake.
